CISCO Security Advisory
Published Date: Not specified
CVE: CVE-2026-20308
Advisory Summary
⬛ 🔒 Cisco IOS XE Web-Based Management DoS Advisory (CVE-2026-20308)
🚨 Alarm: A Denial of Service issue was identified in the web-based management interface of Cisco IOS XE Software, where a remote attacker (authenticated, low privileges) can trigger the interface to become unresponsive.
- Root cause: Insufficient input validation in the web UI.
- Attack path: Send crafted input to the affected web-based management endpoint.
- Impact: The web management interface may stop responding, disrupting administration and potentially affecting operational workflows that rely on GUI-based access.
- Authentication required: Attacker must be authenticated, but only low privileges are needed.
- Remote exploit: The attack can be performed over the network against the device’s web management interface.
- Cisco released software updates that address CVE-2026-20308.
- No workarounds are provided for this vulnerability—mitigation depends on patching and reducing access to the web interface.
- Restrict web UI access via ACLs / firewall rules to trusted admin networks only.
- Consider disabling web management services where not required.
-2026-20308
Reference: Vendor Advisory